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Prior research investigating situations involving one trustor and multiple trustees often examines how a trustor's trust in one party affects their amount of trust in another party. This paper fills a gap by predicting the effects of trust. The Perceived Influence (PI) Model of Trust is an individual-level model focused on the perceptions of a trustor. It builds upon the Mayer et al. (1995) model by integrating insights from literature on task interdependence and expanding to two trustees. The PI model describes and explains three possibilities for how a trustor's trust in two trustees may combine to form a sense of aggregate multi-trustee trust via: (1) additive effects, such that the trustor's trust in each of the trustees has independent effects on the aggregate; (2) compulsory effects, such that increasing the amount of trust in one trustee increases the effect of trust in the other trustee; and (3) compensatory effects, such that increasing trust in one trustee decreases the effect of trust in the other trustee. We propose that the theoretical mechanism explaining which of these three possibilities takes place is the trustor's perceived influence of the trustees, which is tightly linked to perceptions of task requirements necessary to attenuate the trustor's risk. The PI model begins to fill an important gap in the literature pertaining to pervasive, but rarely considered, multi-trustee situations, and proposes the importance of trustor perceptions of trustee influence and task requirements for future models of trust.

The global scale and unpredictable nature of the current COVID-19 pandemic have put a significant burden on health care and public health leaders, for whom preparedness plans and evidence-based guidelines have proven insufficient to guide actions. This article presents a review of empirical articles on the topics of "crisis leadership" and "pandemic" across medical and business databases between 2003 (since SARS) and—December 2020 and has identified 35 articles for detailed analyses. We use the articles' evidence on leadership behaviors and skills that have been key to pandemic responses to characterize the types of leadership competencies commonly exhibited in a pandemic context. Task-oriented competencies, including preparing and planning, establishing collaborations, and conducting crisis communication, received the most attention. However, people-oriented and adaptive-oriented competencies were as fundamental in overcoming the structural, political, and cultural contexts unique to pandemics.

The global scale and unpredictable nature of the current COVID-19 pandemic have put a significant burden on health care and public health leaders, for whom preparedness plans and evidence-based guidelines have proven insufficient to guide actions. This article presents a review of empirical articles on the topics of "crisis leadership" and "pandemic" across medical and business databases between 2003 (since SARS) and—December 2020 and has identified 35 articles for detailed analyses. We use the articles' evidence on leadership behaviors and skills that have been key to pandemic responses to characterize the types of leadership competencies commonly exhibited in a pandemic context. Task-oriented competencies, including preparing and planning, establishing collaborations, and conducting crisis communication, received the most attention. However, people-oriented and adaptive-oriented competencies were as fundamental in overcoming the structural, political, and cultural contexts unique to pandemics.

Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known of winter ecology in these systems, due to a historical research focus on summer 'growing seasons'. We executed the first global quantitative synthesis on under-ice lake ecology, including 36 abiotic and biotic variables from 42 research groups and 101 lakes, examining seasonal differences and connections as well as how seasonal differences vary with geophysical factors. Plankton were more abundant under ice than expected; mean winter values were 43.2% of summer values for chlorophyll a, 15.8% of summer phytoplankton biovolume and 25.3% of summer zooplankton density. Dissolved nitrogen concentrations were typically higher during winter, and these differences were exaggerated in smaller lakes. Lake size also influenced winter-summer patterns for dissolved organic carbon (DOC), with higher winter DOC in smaller lakes. At coarse levels of taxonomic aggregation, phytoplankton and zooplankton community composition showed few systematic differences between seasons, although literature suggests that seasonal differences are frequently lake-specific, species-specific, or occur at the level of functional group. Within the subset of lakes that had longer time series, winter influenced the subsequent summer for some nutrient variables and zooplankton biomass. ; National Science Foundation (NSF DEB) [1431428, 1136637]; Washington State University; Russian Science Foundation [14-14-00400]; Ministry of education and science of Russia Gos-Zasanie project [1354-2014/51]; Natural Environment Research Council [NE/J00829X/1, 1230750, NE/G019622/1, NE/J010227/1] ; Funding was provided by the National Science Foundation (NSF DEB #1431428; NSF DEB #1136637) and Washington State University. M. Timofeyev and E. Silow were partially supported by Russian Science Foundation project No 14-14-00400 and Ministry of education and science of Russia Gos-Zasanie project No 1354-2014/51. We are grateful to Marianne Moore, Deniz Ozkundakci, Chris Polashenski and Paula Kankaala for discussions that greatly improved this work. We also gratefully acknowledge the following individuals for contributing to this project: John Anderson, Jill Baron, Rick Bourbonniere, Sandra Brovold, Lluis Camarero, Sudeep Chandra, Jim Cotner, Laura Forsstom, Guillaume Grosbois, Chris Harrod, Klaus D. Joehnk, T.Y. Kim, Daniel Langenhaun, Reet Laugaste, Suzanne McGowan, Virginia Panizzo, Giampaolo Rossetti, R.E.H. Smith, Sarah Spaulding, Helen Tammert, Steve Thackeray, Kyle Zimmer, Priit Zingel and two anonymous reviewers. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government.